問題詳情

14. The door is unlocked. There ____________ someone breaking into this house.
(A) must be
(B) must have
(C) must have been
(D) must have had

參考答案

答案:[無官方正解]
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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